server/AdminPanel/client/webpack.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CopyPlugin = require('copy-webpack-plugin');
const webpack = require('webpack');
const dotenv = require('dotenv');

// Load environment variables from .env files
// Priority: .env.local > .env.development/.env.production > .env
const envFiles = ['.env.local', process.env.NODE_ENV === 'production' ? '.env.production' : '.env.development', '.env'];

envFiles.forEach(file => {
  dotenv.config({path: file});
});

module.exports = {
  entry: './src/index.js',
  output: {
    filename: 'main.[contenthash].js',
    path: path.resolve(__dirname, 'build'),
    // Use relative URLs so assets load under any prefix (e.g., /admin)
    publicPath: ''
  },

  devServer: {
    static: {
      directory: path.join(__dirname, 'build'),
      publicPath: ''
    },
    port: 3000,
    open: true,
    historyApiFallback: true
  },

  plugins: [
    new HtmlWebpackPlugin({
      template: path.join(__dirname, 'public', 'index.html')
    }),
    new CopyPlugin({
      patterns: [
        {
          context: path.resolve(__dirname, 'public'),
          from: 'images/*.*',
          to: 'images/[name][ext]'
        },
        {
          context: path.resolve(__dirname, 'src/assets'),
          from: '*.svg',
          to: 'static/[name][ext]'
        },
        {
          context: path.resolve(__dirname),
          from: 'config.json',
          to: 'config.json'
        }
      ]
    }),
    new webpack.DefinePlugin({
      'process.env.REACT_APP_BACKEND_URL': JSON.stringify(process.env.REACT_APP_BACKEND_URL)
    })
  ],

  module: {
    rules: [
      {
        test: /\.(js)$/,
        exclude: /node_modules/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: [['@babel/preset-react', {runtime: 'automatic'}], '@babel/preset-env']
          }
        }
      },
      {
        test: /\.module\.(css|scss)$/i,
        use: [
          'style-loader',
          {
            loader: 'css-loader',
            options: {
              modules: {
                localIdentName: '[local]-[hash:base64:5]'
              }
            }
          },
          {
            loader: 'sass-loader',
            options: {
              api: 'modern'
            }
          }
        ]
      },
      {
        test: /\.(css|scss)$/i,
        exclude: /\.module\.(css|scss)$/i,
        use: [
          'style-loader',
          'css-loader',
          {
            loader: 'sass-loader',
            options: {
              api: 'modern'
            }
          }
        ]
      },
      {
        test: /\.(png|svg|jpg|jpeg|gif)$/i,
        type: 'asset/resource',
        generator: {
          filename: 'static/[hash][ext]'
        }
      }
    ]
  },

  resolve: {
    extensions: ['', '.js'],
    alias: {
      '@components': path.resolve(__dirname, 'src/components'),
      '@screen': path.resolve(__dirname, 'src/screen'),
      '@services': path.resolve(__dirname, 'src/services'),
      '@store': path.resolve(__dirname, 'src/store'),
      '@utility': path.resolve(__dirname, 'src/utility'),
      '@assets': path.resolve(__dirname, 'src/assets')
    }
  }
};